zhj:topBarBackground="#00ff00">

</com.zhuanghongji.customviewzhj.view.TopBar>

TopBar.java :

---

import com.zhuanghongji.customviewzhj.R;

public class TopBar extends RelativeLayout {

private Button mLeftBtn;

private TextView mTitleTv;

// 左Button属性

private int leftBtnTextColor;

private Drawable leftBtnBackground;

private String leftBtnText;

// title属性

private int titleTextColor;

private String titleText;

private float titleTextSize;

// topBar属性

private Drawable topBarBackground;

// 布局属性

private LayoutParams leftBtnParams, titleParams;

// 点击事件监听器接口 -- public

public interface TopBarClickListener {

    public void leftBtnClick();

}

private TopBarClickListener listener;

// 设置监听器

public void setOnTopBarClickListener(TopBarClickListener listener) {

    this.listener = listener;

}

// 供调用的方法

public void setLeftButtonIsVisible(boolean visible) {

    if (visible) {

        mLeftBtn.setVisibility(View.VISIBLE);

    } else {

        mLeftBtn.setVisibility(View.GONE);

    }

}

// 三个构造方法，均调用均调用三个参数的那个

public TopBar(Context context) {

    this(context, null);

}

public TopBar(Context context, AttributeSet attrs) {

    this(context, attrs, 0);

}

public TopBar(Context context, AttributeSet attrs, int defStyleAttr) {

    super(context, attrs, defStyleAttr);

    TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TopBar);

    // 取自定义属性 -- leftBtn

    leftBtnText = ta.getString(R.styleable.TopBar![](https://www.icode9.com/i/ll/?i=img_convert/7297b262077e297599865bc35ea8dd49.png)

_leftBtnText);

    leftBtnTextColor = ta.getColor(R.styleable.TopBar_leftBtnTextColor, Color.WHITE);

    leftBtnBackground = ta.getDrawable(R.styleable.TopBar_leftBtnBackground);

    // 取自定义属性 -- title

    titleText = ta.getString(R.styleable.TopBar_titleText);

    titleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor, Color.WHITE);

    titleTextSize = ta.getDimension(R.styleable.TopBar_titleTextSize, 12);

    // 取自定义属性 -- topBar

    topBarBackground = ta.getDrawable(R.styleable.TopBar_topBarBackground);

    //回收TypeArray(避免浪费资源，避免以为缓存导致的错误)

    ta.recycle();

    mLeftBtn = new Button(context);

    mTitleTv = new TextView(context);

    //设置自定义属性

    mLeftBtn.setText(leftBtnText);

    mLeftBtn.setTextColor(leftBtnTextColor);

    mLeftBtn.setBackground(leftBtnBackground);

    mTitleTv.setText(titleText);

    mTitleTv.setTextSize(titleTextSize);

    mTitleTv.setTextColor(titleTextColor);

    setBackground(topBarBackground);  // 可以通过此代码改变topBar背景色

// setBackgroundColor(0x00ff00); // 在这里我们直接设置成绿色

    // 设置布局 -- 左Button

    leftBtnParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

    leftBtnParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);

    leftBtnParams.addRule(RelativeLayout.CENTER_VERTICAL, TRUE);

    addView(mLeftBtn, leftBtnParams);

    // 设置布局 -- title

    titleParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

    titleParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);

    addView(mTitleTv, titleParams);

    mLeftBtn.setOnClickListener(new OnClickListener() {

        @Override

        public void onClick(View v) {

            listener.leftBtnClick();    //左Button点击事件

        }

    });

}

}

attrs.xml :

---

<?xml version="1.0" encoding="utf-8"?>

<declare-styleable name="TopBar">

    <!--文字-->

    <attr name="leftBtnText" format="string"/>

    <attr name="titleText" format="string"/>

    <!--文字颜色-->

    <attr name="leftBtnTextColor" format="color"/>

es>

<declare-styleable name="TopBar">

    <!--文字-->

    <attr name="leftBtnText" format="string"/>

    <attr name="titleText" format="string"/>

    <!--文字颜色-->

    <attr name="leftBtnTextColor" format="color"/>